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Natalija [7]
3 years ago
14

What is the number of moles in 78.4 l of neon at stp?

Chemistry
1 answer:
erma4kov [3.2K]3 years ago
8 0
At STP for any gas, 22.4 liters = 1 mole.
78.4 L * 1mole/22.4L = 3.50 moles
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Energy Levels: An ionized atom having Z protons has had all but one of its electrons removed. If E is the total energy of the gr
S_A_V [24]

Explanation:

Formula for energy value is as follows.

                     E = \frac{-E_{0}}{n^{2}}

where,      E_{0} = 13.6

                         n = number of shell                          

So, at ground state energy  of hydrogen atom will be as follows.

                    E = \frac{-E_{0}}{n^{2}}

                       = \frac{-13.6}{(1)^{2}}

                      = -13.6

Hence, for an ionized atom value of energy will be as follows.

                    E' = -13.6 \times Z^{2}

    or,            E' = E \times Z^{2}

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7 0
3 years ago
Tails of phospholipids that don't like water
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Those tails are called hydrophobic. You can note the etymology: hydro= water, phobi = fear, aversion, dislike.

Phospholipds' tail is a long non polar chain, made of Carbon and Hydorgens, that rejects water (a polar solvent) and is attracted to non-polar compounds (oil for example).  That is why that tails can atract dirt.
3 0
3 years ago
when 0.863 mol acetone is dissolved in 500 g benzene, the freezing point of benzene drops 8.84°C. what is the molal freezing poi
sveticcg [70]

Answer:

  • <u>Kf = 5.12 °C/m</u>

Explanation:

<u>1) Data:</u>

a) Solute: acetone

b) Solvent: benzene

c) n (solute) = 0.863 mol

d) mass of solvent = 500 g = 0.500 Kg

e) ΔTf = 8.84 °C

f) Kf = ?

<u>2) Formulae:</u>

  • Depression of freezing point: ΔTf = m . Kf

  • Molality: m = n (solute) / kg solvent

<u>3) Solution:</u>

a) m = 0.863 mol / 0.500 kg = 1.726 m

b) Kf = ΔTf / m = 8.84°C / 1.726 m  = 5.12 °C/m ← answer

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3 years ago
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tensa zangetsu [6.8K]

Answer:D

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A certain compound is made up of one phosphorus (P) atom, three fluorine (F) atoms, and one oxygen (O) atom. What is the chemica
poizon [28]
PF_{3}O
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